Sierra Classic 2500 4WD V8-6.0L (2007)
Hydraulic Control Assembly - Antilock Brakes: Service and Repair
Brake Pressure Modulator Valve Replacement
Removal Procedure
Caution: Refer to Brake Fluid Irritant Caution.
1. Caution: Refer to Battery Disconnect Caution.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice.
Remove the negative battery cable.
2. Important: The area around the electronic hydraulic control unit (EHCU) MUST be free from loose dirt to prevent contamination of
disassembled ABS components.
Thoroughly wash all contaminants from around the EHCU.
3. Disconnect the chassis electrical harness connectors from the electronic brake control module (EBCM).
4. Important: Make sure that brake lines are tagged and kept in order for proper reassembly.
Disconnect 5 brake lines from the brake pressure modulator valve (BPMV).
5. Remove the bolts (4) securing the EHCU mounting bracket (3) to the frame rail (5).
6. Remove the EHCU assembly (1) from the vehicle.
7. Remove the bolts (4) securing the BPMV mounting bracket (5) to the BPMV (3).
8. Disconnect the 2-way ABS pump motor connector.
9. Remove the bolts (1) from the EBCM (2).
10. Notice: Do not use a tool to pry the EBCM or the BPMV. Excessive force will damage the EBCM.
Important: Do not reuse the EBCM mounting bolts. Always install new bolts.
Remove the EBCM (2) from the BPMV (3). Removal may require a light amount of force.
11. Clean the EBCM to BPMV mounting surfaces with a clean cloth.
